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84 Aspire Z3750 / Z3751 / Z5750 / Z5751 AIO Computer Service Guide
Clearing CMOS
You may need to clear the Setup configuration values (CMOS) if the configuration has been corrupted, or if
incorrect settings made in the Setup Utility caused error messages to be unreadable. This procedure will clear
the BIOS supervisor password as well.
Use the CLR_CMOS jumper to clear the CMOS data.
• 1-2 position: Normal operation (default)
• 2-3 position: Clear CMOS data
To clear the CMOS data:
1. Turn off the power to the computer and all peripherals.
2. Unplug the power cord from the computer.
3. Unplug the network cable and all connected peripheral devices from the computer.
4. Place the computer on a flat, steady surface with the rear cover facing upward.
5. Remove the computer stand, rear cover, and the I/O cable plate by following the procedures described on
pages 28–31.
6. Remove the wall mount plate by following the procedure described on page 40.
7. Remove the graphics card and HDD assemblies by following the procedures described on pages 43–45.
8. If necessary, remove any other assemblies or cables that prevent access to the CMOS clear jumper.
9. Locate the CLR_CMOS jumper on the mainboard.
10. Remove the jumper block and set it over the 2-3 pins for 20 to 30 seconds.
11. Return the jumper block to its default 1-2 position.
12. Reinstall the graphics card and HDD assemblies.
13. Reinstall any any other assemblies or cables that have previously been removed.
14. Reinstall the wall mount plate, I/O cable plate, rear cover, and the computer stand.
15. Connect the power cord to the system.
16. Press the power button to turn on the computer.
17. During POST, press Delete to access the Setup Utility.
18. Press F9 to load the system default values.
19. Press F10 to save the changes you made and close the Setup Utility.